I have mouth infection and this leads to a severe patches / grooves inside my mouth and my doctor says my small intestine last part which takes the b-complex from food is not working and giving me injections of b-complex, it happens whenever I go out of town and eat outside food, some ingredients which I am unable to figure out initiates this problem and takes 5-7 days to course if I take b-complex injection on alternate days. My doctor says there is no permanent solution of this problem. Can your expert doctor panel advice on this problem.